go to ORKG: http://orkg.org/orkg/predicate/P33
approach
- http://orkg.org/orkg/shapes/orkgc_Resource
- http://orkg.org/orkg/shapes/orkgc_ContributionDeleted
- http://orkg.org/orkg/shapes/orkgc_C116019
- http://orkg.org/orkg/shapes/orkgc_C115000
- http://orkg.org/orkg/shapes/orkgc_Method
- http://orkg.org/orkg/shapes/orkgc_Contribution
- http://orkg.org/orkg/shapes/orkgc_C91000